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Finding the Fourth Proportional to 103,674.10, 155,675.18 and 78,742.30

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Solution

The fourth proportional to 103,674.10, 155,675.18 and 78,742.30 is: 118,238.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,674.10 : 155,675.18 = 78,742.30 : x
  2. Step 2: Convert to fraction form
    103,674.10/155,675.18 = 78,742.30/x
  3. Step 3: Cross multiply
    103,674.10x = 155,675.18 × 78,742.30
  4. Step 4: Simplify right side
    103,674.10x = 12,258,221,726.11
  5. Step 5: Solve for x
    x = 12,258,221,726.11/103,674.10
  6. Step 6: Final answer
    x = 118,238.03

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.